Surgical Constructs and Methods for Securing Tissue

ABSTRACT

Suture constructs and methods are provided for securing soft tissue to bone. One exemplary embodiment of a construct includes a first limb, a second limb, a coaxial region, and a collapsible snare defined by the first and second limbs. The coaxial region can be formed by a portion of the second limb being disposed in a volume of the first limb, which allows for a low profile construct that is useful in various soft tissue repair procedures. The construct can be configured to be disposed in tissue to draw the tissue toward bone, and the coaxial region can be deconstructed so that the first and second limbs can be used to help secure the desired location of the tissue with respect to the bone. Various features of the construct and methods for using the same in a surgical procedure are also provided.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 13/728,044 filed on Dec. 27, 2012, and entitled “Surgical Constructs and Methods for Securing Tissue,” which is hereby incorporated by reference in its entirety.

FIELD

The present disclosure relates to surgical constructs and methods for securing soft tissue to bone, and more particularly relates to surgical constructs having reduced profiles for use in securing soft tissue while minimizing or eliminating the tying of knots to tension and secure the tissue.

BACKGROUND

A common injury, especially among athletes and people of advancing age, is the complete or partial detachment of tendons, ligaments, or other soft tissues from bone. Tissue detachment may occur during a fall, by overexertion, or for a variety of other reasons. Surgical intervention is often needed, particularly when tissue is completely detached from its associated bone. Currently available devices for tissue attachment include screws, staples, suture anchors, and tacks. Currently available devices for patients of advancing age can be particularly insufficient due to soft and weak bones leading to inadequate fixation between the anchor and bones and the anchors and filaments with which the anchors are coupled.

Repair constructs made from one or more surgical filaments are typically used in soft tissue repair procedures to secure the tissue in a desired location. The repair constructs are typically disposed through one or more portions of the tissue to be repaired, which can cause trauma to the tissue, and are often coupled to anchors disposed in bone to which the tissue is to be approximated. While devices and techniques have been developed to help minimize trauma associated with passing repair constructs through tissue, there is still room for further improvement. For example, some repair constructs typically include a sleeve disposed around at least a portion of the limbs of filament of the construct. The sleeve can assist in minimizing trauma to tissue, and also in managing the limbs of suture while the construct is being disposed through tissue. However, the sleeve still adds extra size and cost to the construct. Additionally, there remains a desire to minimize the number of knots used in conjunction with the repair construct when performing soft tissue repair procedures. A variety of different knots, such as sliding knots, can be used to help draw and secure soft tissue with respect to bone. Although the tying of knots at a surgical site is common, in some instances knots can have a tendency to slip, which in turn can cause a loss of tension between the tissue and bone. This drawback is sometimes referred to as a loss of “loop security.” In addition to this “loop security” issue, conventional knots typically have an overall size that can be obstructive or intrusive, especially in tight joints, which may damage cartilage or other tissue by abrasion with the knot.

It is therefore desirable to provide repair constructs and methods that reduce the amount of trauma associated with using repair constructs while maintaining or improving the holding strength such constructs and methods can provide. It is also desirable to provide constructs and methods for use in soft tissue repair that minimize or eliminate the number and size of knots to be tied by a surgeon, particularly during arthroscopic repair procedures.

SUMMARY

Surgical constructs and methods are generally provided for securing soft tissue to bone. In one exemplary embodiment the surgical construct includes a first limb, a second limb that is shorter than the first limb, a coaxial region, and a collapsible snare defined by the first limb and the second limb. The coaxial region can be formed by a terminal end of the second limb being disposed within a volume of the first limb, with the snare being located on one side of the coaxial region and a terminal end of the first limb being disposed on the other side of the coaxial region. The first and second limbs can be from the same surgical filament. In other embodiments the first and second limbs can be from separate surgical filaments. The surgical filament(s) can include, for example, braided suture. The collapsible snare can include a slidable knot that adjusts a size of an opening defined by the snare by moving towards and away from the coaxial region. In one embodiment, the size of the opening defined by the snare decreases when the slidable knot moves away from the coaxial region and increases when the slidable knot moves towards the coaxial region.

The first limb of the construct can be cannulated at the coaxial region. A length of the coaxial region can be substantially shorter than a length of the first limb extending from the other side of the coaxial region. The length of the coaxial region can also be substantially shorter than lengths of the first and second limbs on the side of the coaxial region on which the snare is located. The coaxial region can be configured to be deconstructed after placement of the suture construct at a surgical location. This can allow the first and second limbs to be used to secure a location of the suture construct, for instance after tissue coupled to the suture construct has been advanced to a desirable location proximate to bone.

The suture construct can also include a suture anchor having a filament engagement feature. A portion of the construct can be slidably disposed around a portion of the filament engagement feature. In some embodiments the snare can extend from one side of the anchor and the coaxial region can extend from another side of the anchor. In some other embodiments the portion of the first limb that is disposed on the other side of the coaxial region can engage the filament engagement feature of the anchor such that this portion of the first limb extends from both sides of the anchor.

One exemplary embodiment of a surgical repair method includes selecting a surgical repair construct having a snare defined by a first filament limb and a second filament limb, and a coaxial region formed by a terminal end of the second filament limb being disposed within a volume of the first filament limb. The method can further include fixing an anchor in bone in proximity to detached soft tissue. Further, a terminal end of the first filament limb can be passed through a portion of the detached soft tissue and around an engagement feature of the anchor. The resulting configuration can be one in which the snare extends from one side of the anchor and the terminal end of the first filament limb extends from another side of the anchor. Still further, the method can include passing the terminal end of the first filament limb through the snare, collapsing the snare to engage the soft tissue, advancing the collapsed snare distally to bring the tissue into proximity with the bone, and removing the terminal end of the second filament limb from the volume of the first filament limb to eliminate the coaxial region. The first and second filament limbs can then be used to tie one or more knots proximate to the collapsed snare to maintain the tissue at a desired location in proximity to the bone. The passing, collapsing, and advancing steps, however, can be effected without tying a knot in the first or second filament limbs.

In some embodiments at least one of a first end of the surgical repair construct and a second end of a surgical repair construct can be passed through a surgical cannula. Further, in some embodiments the method can include passing the terminal end of the first filament limb through a second portion of the detached soft tissue. The step of collapsing the snare can include collapsing the snare around the first filament limb extending from the coaxial region and disposed on an opposite side of the coaxial region from the snare. Alternatively, in some embodiments the step of passing the terminal end of the first filament limb through the snare can include passing the coaxial region through the snare and then collapsing the snare can include collapsing the snare around the first filament limb and the second filament limb disposed therethrough.

The anchor that is fixed in bone can include a suture shuttle filament slidably coupled to the engagement feature. The suture shuttle filament can have a free end and a receiving end and can be coupled to the anchor prior to the step of passing a terminal end of the first filament limb through a portion of the detached soft tissue. In such embodiments, the step of passing a terminal end of the first filament limb through a portion of the detached soft tissue and around an engagement feature of the anchor can rely on the suture shuttle filament to assist in moving the surgical repair construct. More particularly, the terminal end of the first filament can be coupled to the receiving end of the suture shuttle filament and a force can be applied to the free end of the suture shuttle filament to move the receiving end of the suture shuttle filament, and thus the terminal end of the first filament limb, toward and then around the engagement feature of the anchor. The suture shuttle filament can then pass around and out of contact with the engagement feature of the anchor, thereby allowing the surgical repair construct to be in direct contact with the engagement feature. Eventually, the resulting configuration is the same as described above, with the snare extending from one side of the anchor and the coaxial region extending from another side of the anchor. In some embodiments the suture shuttle filament can be disposed through the detached soft tissue in two locations. As a result, the surgical repair construct can also be disposed through the detached soft tissue in two locations following the step of applying a force to the free end of the suture shuttle filament.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1A is a schematic view of one exemplary embodiment of a surgical repair construct;

FIG. 1B is a detail view of a coaxial region of the surgical repair construct of FIG. 1A;

FIG. 1C is a schematic view of the surgical repair construct of FIG. 1A illustrating one non-limiting example of potential lengths of portions of the construct;

FIG. 2 is a schematic view of the surgical repair construct of FIG. 1A coupled to a suture anchor;

FIG. 3 is schematic view of a suture shuttle filament coupled to the suture anchor of FIG. 2; and

FIGS. 4A-4I are sequential view of one exemplary embodiment for using the surgical repair construct of FIG. 1A to secure tissue to bone.

DETAILED DESCRIPTION

Certain exemplary embodiments will now be described to provide an overall understanding of the principles of the structure, function, manufacture, and use of the constructs and methods disclosed herein. One or more examples of these embodiments are illustrated in the accompanying drawings. Those skilled in the art will understand that the constructs and methods specifically described herein and illustrated in the accompanying drawings are non-limiting exemplary embodiments and that the scope of the present invention is defined solely by the claims. The features illustrated or described in connection with one exemplary embodiment may be combined with the features of other embodiments. Such modifications and variations are intended to be included within the scope of the present invention. Additionally, to the extent that linear or circular dimensions are used in the description of the disclosed constructs and methods, such dimensions are not intended to limit the types of shapes that can be used in conjunction with such constructs and methods. A person skilled in the art will recognize that an equivalent to such linear and circular dimensions can easily be determined for any geometric shape. Sizes and shapes of the constructs, and the components thereof, can depend at least on the anatomy of the subject in which the constructs will be used, the size and shape of components with which the constructs will be used, and the methods and procedures in which the constructs will be used.

The figures provided herein are not necessarily to scale. Further, to the extent arrows are used to describe a direction a component can be tensioned or pulled, these arrows are illustrative and in no way limit the direction the respective component can be tensioned or pulled. A person skilled in the art will recognize other ways and directions for creating the desired tension or movement. Likewise, while in some embodiments movement of one component is described with respect to another, a person skilled in the art will recognize that other movements are possible. By way of non-limiting example, in embodiments in which a sliding knot is used to help define a snare, a person skilled in the art will recognize that different knot configurations can change whether moving the knot in one direction will cause a size of an opening defined by the snare will increase or decrease. Additionally, a number of terms may be used throughout the disclosure interchangeably but will be understood by a person skilled in the art. By way of non-limiting example, the terms “suture” and “filament” may be used interchangeably.

Surgical repair constructs and methods for soft tissue repair are generally provided and they generally involve the use of surgical filaments that are configured in a variety of manners to minimize and/or eliminate the tying of knots during a surgical procedure. The constructs described herein provide superior strength for use in a number of different surgical procedures, such as rotator cuff and instability repair procedures and other types of tendon and tissue repair procedures. The designs of the constructs described herein are such that they have a particularly low profile, thereby allowing a construct to pass through the tissue with minimal trauma to the tissue and to become associated with the tissue without tying knots. The low profile results from inserting one limb of filament into another and eliminating any sort of sleeve, which is often used to assist in shuttling limbs of filament through tissue. Further, the designs of the constructs are such that they limit the number of filaments that are used to feed the construct through the tissue, or otherwise associate the construct with tissue. As described, a single limb of filament can be used to associate the construct with tissue that is being attached to bone, thereby assisting a surgeon with suture management.

As shown by one exemplary embodiment of a surgical repair construct 10 in FIG. 1A, the constructs of the present disclosure are generally formed from a single elongate filament that is folded to form a first limb 12 and a second limb 14. The first limb 12 can generally be longer than the second limb 14, and the two limbs can be used to form both a snare 20 and a coaxial region 30 as described in greater detail below. The snare 20, which is disposed on a first end 10 a of the construct 10, can be configured to receive an opposite end 10 b of the construct 10 and is operable to collapse around a portion of the construct disposed in an opening 22 thereof. The coaxial region 30 is generally configured to allow the shorter second limb 14 to be disposed within a volume of the first limb 12, thereby eliminating any additional component for suture management, such as a sleeve. The first limb 12 can then extend beyond the coaxial region 30 to form a tail 40 of the construct 10. The tail 40 can assist a surgeon with inserting the construct 10 to a desired location for a surgical procedure.

The collapsible snare 20 can be formed using any number of techniques known to those skilled in the art. In the illustrated embodiment the first and second limbs 12, 14 are formed to include a sliding knot 24. The sliding knot 24 is configured such that as it moves toward the coaxial region 30, a size of the opening 22 defined by the snare 20 increases, and as the knot 24 moves away from the coaxial region 30, the size of the opening 22 decreases. Some exemplary knot types include a Buntline Hitch, a Tennessee Slider, a Duncan Loop, and a Hangman's Noose. A person skilled in the art will understand that in other configurations, a size of the opening defined by the snare may be adjusted in different manners, depending on the type of knot, desired use, etc. Some exemplary snare and formations thereof are described in U.S. Published Patent Application No. 2012/0130424 of Sengun et al. and U.S. application Ser. No. 13/465,288, entitled “Systems, Devices, and Methods for Securing Tissue, and filed May 7, 2012, the content of which is incorporated by reference in their entireties.

Further, in some embodiments a snare-retaining member (not shown) can be disposed across the first and second limbs 12, 14, between the snare 20 and the coaxial region 30, for instance to prevent the unintentional collapse of the opening 22 of the snare 20, such as while the construct 10 is being moved through tissue. A snare-retaining member can include a flexible member or pin, such as the flexible members and pins described in U.S. application Ser. No. 13/465,299, entitled “Systems, Devices, and Methods for Securing Tissue” and filed May 7, 2012, the content of which is incorporated by reference in its entirety.

The coaxial region 30 in the illustrated embodiment is formed by passing terminal end 14 t of the second limb 14 into a volume of the first limb 12. As shown in FIG. 1B, at least a portion of the first limb 12 can be cannulated, and an opening 16 on a side of the first limb 12 allows the second limb 14 to be disposed in the first limb 12. The opening 16 can be created manually by forming a hole in the side of the first limb 12 and removing a core of the first limb 12 so that there is space to receive the second limb 14. Alternatively, the filament of the first limb 12 can be a braided suture with a core removed from at least the portion of the first limb 12 that is part of the coaxial region 30, thereby allowing the first limb 12 to receive the second limb 14. In other embodiments a core of a filament, braided or otherwise, is not removed and the second limb 14 is still disposed in first limb 12 using techniques known to those skilled in the art. The junction 18 at which the second limb 14 engages the first limb 12 can be a self-maintaining junction. As a result, pulling on the tail 40 of the surgical construct 10 does not cause the second limb 14 to pull out of the first limb 12. Rather, pulling on the tail 40 can actually force the first limb 12 to collapse around the second limb 14, thereby providing sufficient friction between the two limbs 12 and 14 to hold them together. The two limbs 12 and 14, however, can be separated manually at the junction 18 by applying a sufficient amount of force. Although in the illustrated embodiment the junction 18 is formed by inserting the terminal end 14 t of the second limb 14 into a portion of the first limb 12, a person skilled in the art will understand other ways by which the junction can be formed without departing from the spirit of the present disclosure.

The tail 40 of the construct 10 is formed by the remaining portion of the first limb 12 that extends beyond the coaxial region 30. The tail 40 can be used to help lead insertion of the construct 10 in tissue, coupling the construct 10 to a suture anchor, and leading the second end 10 b of the construct 10 into the opening 22 of the snare 20 during tissue repair procedures, among other things. Accordingly, a length and thickness of the tail 40 can be such that it ensures robust shuttling of the construct 10 during a surgical procedure.

The filament used to form the first and second limbs 12 and 14 can be any type and material typically used as filaments, including a cannulated filament, a braided filament, and a mono filament. The type and strength of the filament can depend, at least in part, on the other materials of the construct, if any, such as an anchor, the tissue and other components through which it will be passed or coupled to, and the type of procedure in which it is used. In one exemplary embodiment the filament is a #0 filament (about 26 gauge to about 27 gauge), such as an Orthocord™ filament that is commercially available from DePuy Mitek, Inc., DePuy Mitek Inc., 325 Paramount Drive, Raynham, Mass. 02767, or an Ethibond™ filament that is commercially available from Ethicon, Inc., Route 22 West, Somerville, N.J. 08876. A portion of the core of the filament can be removed to form a cannulated portion of the first limb 12 for use in the coaxial region 30. The thickness of the filament should provide strength in the connection but at the same time minimize the trauma caused to tissue through which it passes. In some embodiments the filament can have a size between about a #5 filament (about 20 gauge to about 21 gauge) and about a #3-0 filament (about 29 gauge to about 32 gauge). Orthocord™ suture is approximately fifty-five to sixty-five percent PDS™ polydioxanone, which is bioabsorbable, and the remaining thirty-five to forty-five percent ultra high molecular weight polyethylene, while Ethibond™ suture is primarily high strength polyester. The amount and type of bioabsorbable material, if any, utilized in the filaments of the present disclosure is primarily a matter of surgeon preference for the particular surgical procedure to be performed. Additionally, although in the illustrated embodiment a single filament is used to form the first and second limbs 12 and 14, a separate filament can be used for each of the first and second limbs 12 and 14 without departing from the spirit of the disclosures provided herein.

The lengths of the various portions of the construct 10 can likewise depend, at least in part, on the other materials of the construct, if any, the tissue and other components through which it will be passed or coupled to, the lengths of the various portions of the construct, and the type of procedure in which the construct is used. The various portions include the portions of the first and second limbs 12 and 14 on the side of the coaxial region 30 the snare 20 is located, the coaxial region 30, and the tail 40. In the illustrated embodiment the coaxial region 30 is substantially shorter than both the tail 40 and the portions of the first and second limbs 12 and 14 on the side of the coaxial region 30 the snare 20 is located. FIG. 1C provides one schematic representation of a possible proportional length scheme comparing a length L₁ of a region between the knot 24 and one end 30 a of the coaxial region 30, a length L₂ of the coaxial region 30, and a length L₃ from the other end 30 b of the coaxial region 30 to a terminal end 12 t of the first limb 12. As shown the length L₁ can be about 17 inches, the length L₂ can be about 2 inches, and the length L₃ can be about 14 inches. A person skilled in the art will recognize that these lengths can change during the course of a procedure. For example, as the sliding knot 24 is selectively moved toward or away from the coaxial region 30, the length L₁ will change. Likewise, a surgeon may be able to manually adjust the lengths L₂ and L₃. Further, the lengths provided in the illustrated embodiment of FIG. 1C in no way limit values of the lengths L₁, L₂, and L₃. Generally, the length L₁ can be approximately in the range of about 5 inches to about 30 inches, the length L₂ can be approximately in the range of about 0.5 inches to about 8 inches, and the length L₃ can be approximately in the range of about 6 inches to about 40 inches.

As shown in FIG. 2, the construct 10 can be coupled to a suture anchor 50. The suture anchor 50 can include one or more filament engagement features, such as the filament engagement feature 52 disposed at a distal end 50 d of the anchor 50. In the illustrated embodiment, the snare 20 extends from one side of the anchor and the coaxial region 30 extends from the other side of the anchor. However, in other embodiments the tail 40 can be engaged with the filament engagement feature 52 of the anchor 50 such that the tail 40 extends from both sides of the anchor, for instance as illustrated in FIG. 4D and described further below. Such a configuration can allow the portion of the first and second limbs 12 and 14 extending between the knot 24 and the coaxial region 30 to not be within joint space, thereby assisting with suture management by minimizing the number of limbs emanating from the anchor 50.

As described in greater detail below, in some embodiments the construct 10 can be pre-loaded on the suture anchor 50 prior to insertion of the anchor 50 to a surgical location, while in other embodiments the construct 10 is loaded onto the suture anchor 50 after the anchor is positioned at the surgical location. One skilled in the art will appreciate that a variety of suture anchor types can be used in conjunction with the constructs provided herein. For example, in some embodiments the anchor can be a Gryphon™ anchor that is commercially available from DePuy Mitek, Inc. The constructs described herein can be single-loaded or double-loaded onto a Gryphon™ anchor.

As a result of the configurations of the construct 10 described herein, anchors used in conjunction with the construct 10 can be smaller than previous anchors used in tissue repairs at least because a smaller diameter or thickness of construct can be associated with the anchor. Further, Gryphon™ anchors are merely non-limiting examples of anchor types that can be used in conjunction with the disclosures provided herein. Other types of hard and soft anchors can also be used. Some examples of such anchors include a Healix Ti™ anchor, which is commercial available from DePuy Mitek, Inc., as well as anchors described in U.S. application Ser. No. 13/465,376, entitled “Systems, Devices, and Methods for Securing Tissue Using Snare Assemblies and Soft Anchors,” filed May 7, 2012, and U.S. application Ser. No. 13/623,429, entitled “Systems, Devices, and Methods for Securing Tissue Using Hard Anchors,” filed Sep. 20, 2012, the content of which is incorporated by reference in their entireties.

FIG. 3 illustrates one exemplary embodiment of a suture shuttle filament 60 coupled to the suture anchor 50. Again, virtually any type of suture anchor can be used in conjunction with the shuttles and constructs provided herein, but the illustrated anchor 50 is a Healix anchor. The shuttle 60 can be slidably engaged with the anchor 50 at the filament engagement feature 52 such that a first end 60 a of the shuttle 60 extends from one side of the anchor 50 and a second end 60 b of the shuttle 60 extends from the other side of the anchor 50. The first end 60 a can be configured to be coupled to a repair construct, such as the repair construct 10 of FIG. 1A. As shown, the first end 60 a includes a fixed loop 62, but any other suitable coupling mechanism can be used at the first end 60 a without departing from the spirit of the present disclosure. For example, the first end 60 a can include a clip or a like element to clamp around a repair construct. In other embodiments the loop 62 can be a collapsible snare. Once the repair construct 10 is coupled to the first end 60 a, the second end 60 b can be used to position the repair construct 10 in a desired location as described below with respect to FIGS. 4A-4D.

One exemplary embodiment of a method for performing a rotator cuff repair using the repair construct 10 of FIG. 1A in conjunction with the suture shuttle filament 60 of FIG. 3 is illustrated in FIGS. 4A-4I. A surgical opening can be formed through skin 100 and a cannula can be passed therethrough to create a surgical repair site in a manner well known to those skilled in the art. Although cannulas are often used to define a channel through which the procedure can be performed, the cannula is not shown in FIGS. 4A-4I for ease of illustration. Accordingly, to the extent the figures show components of the construct passing through skin 100, these components would typically be extending through the cannula, which itself is passed through the skin 100. Further, although the constructs and methods described herein are particularly useful for minimally invasive surgery, such as arthroscopic surgery, they can also be used in open surgical procedures.

As shown in FIG. 4A, the anchor 50 and suture shuttle filament 60 illustrated in FIG. 3 can be fixated into bone 102 using ordinary techniques, such as by using a driver to screw or tap the anchor 50 into place. In the illustrated embodiment the suture shuttle filament 60, which includes the first end 60 a having the loop 62 formed therein, is already coupled thereto, although in other embodiments the suture shuttle filament 60 can be slidingly coupled to the anchor 50 after the anchor 50 is positioned at its desired location.

As shown in FIG. 4B, the first and second ends 60 a, 60 b of the suture shuttle filament 60 can be passed through detached soft tissue, such as tendon 104. As shown in FIG. 4C, a portion of the tail 40 of the repair construct 10 of FIG. 1A can be passed through the loop 62, thereby, at least temporarily, coupling the repair construct 10 to the shuttle 60. A force approximately in the direction A can then be applied to the second end 60 b to pull the first end 60 a, and thus the repair construct 10, through the tendon 104 at a first location, around the filament engagement feature 52, and through the tendon 104 at a second location. As a result, as shown in FIG. 4D, the tail 40 can be disposed around the filament engagement feature 52 and, depending on the length of the tail 40, can extend on both sides of the anchor 50. Once the suture shuttle filament 60 has moved the construct 10 to a location that allows a surgeon to grasp the tail 40, either manually or by the use of a surgical tool, the suture shuttle filament 60 can be de-coupled from the repair construct 10. The tail 40 can then be used to continue to shuttle the construct 10 to a desired location, for instance by applying a force in a direction B. Alternatively, the shuttle 60 can continue to be used to shuttle the construct 10 to a desired location for the construct 10 before the shuttle 60 is de-coupled from the construct 10. One non-limiting, exemplary location for the construct 10 is shown in FIG. 4E, in which the snare 20 is disposed on one side of the anchor 50 and the coaxial region 30 is disposed on the other side of the anchor 50, with portions of the first and second limbs 12, 14 that are disposed between the snare 20 and the coaxial region 30 in sliding engagement with the filament engagement feature 52.

As shown in FIG. 4F, the tail 40 and the coaxial region 30 can be passed through the snare 20 such that portions of the first and second limbs 12, 14 that are disposed between the snare 20 and the coaxial region 30 are disposed within the opening 22 of the snare 20, thereby allowing the tendon 104 through which the construct 10 is disposed to be captured. The snare 20 can then be collapsed or dressed around the portions of the first and second limbs 12, 14 disposed therethrough, with the snare 20 remaining distal of the coaxial region 30. In embodiments in which a snare-retaining member is disposed through a portion of the construct 10 to prevent the intentional collapse of the snare 20, the snare-retaining member can be removed prior to collapsing the snare 20.

Alternatively, in other embodiments just the tail 40 can be passed through the snare such that only a portion of the first limb 12 is disposed within the opening 22 of the snare 20, thereby allowing the tendon 104 through which the construct 10 is disposed to be captured. The snare 20 can then be collapsed or dressed around the portion of the tail 40 disposed therethrough. Although in such an embodiment the coaxial region 30 is distal of the snare 20, the snare 20 can be subsequently slid distally toward the tendon to allow the coaxial region 30 to become proximal of the snare 20, as described below with respect to FIG. 4G.

As shown in FIG. 4G, tension can be applied to the second end 10 b of the construct 10 by pulling approximately in a direction C, thereby causing the collapsed snare 20 to slide distally toward the tendon 104 in a zip-line like manner until the snare 20 is adjacent to the tendon 104. Alternatively, tension can be applied to the second end 10 b before the snare 20 is dressed and after the snare 20 is adjacent to the tendon 104, or some combination of the two actions can be used, such as partially dressing the snare 20 before zip-lining it toward the tendon 104.

As shown in FIG. 4H, the coaxial region 30 can be disassembled such that the terminal end 14 t of the second limb 14 is no longer disposed in a volume of the first limb 12. The disassembly can occur at the junction 18, for instance by untucking or pulling out the second limb 14 from the first limb 12. Alternatively, the coaxial region 30 can be removed entirely by cutting the limbs 12 and 14 at a location distal of the coaxial region 30, thereby leaving a portion of the limbs 12 and 14. In either instance, the limbs 12 and 14 can then be cinched or otherwise tied together to assist in securing a location of the collapsed snare 20, and thus the tendon 104 with respect to the bone, as illustrated in FIG. 4I. In the illustrated embodiment, a half-hitch 19 is formed by the surgeon using the first and second limbs 12, 14. A second half-hitch can be formed to lock the location of the first half-hitch 19.

Although in the illustrated embodiment the construct 10 is passed through two portions of tendon 104, alternatively the construct 10 can be passed through only one portion of tendon or tissue while the second portion of the construct 10 can be free of the tendon or tissue. Such an embodiment can be used, for example, during a labral repair. Either of the two ends 10 a, 10 b can be the end that is not passed through the tendon or tissue, although in some embodiments it may be useful to have the end 10 a on which the snare 20 is located to not pass through tissue to minimize the possibility of unintentional collapse of the snare 20. Further, in some embodiments, rather than passing through tissue, a repair construct 10 can be coupled to tissue using other techniques, such as, for example, by wrapping the construct around the tissue.

Still further, although the method described with respect to FIGS. 4A-4I uses the suture shuttle filament 60 to locate the construct 10 in a desired location with respect to the anchor 50, in other embodiments the construct 10 can be pre-coupled to the anchor 50 that is inserted through the cannula and to the surgical location. In such embodiments, exemplary methods can begin at FIG. 4D or 4E, with the construct 10 already being coupled to the anchor 50 and the anchor 50 being fixated into bone 102 using ordinary techniques, such as by using a driver to screw or tap the anchor 50 into place.

One skilled in the art will appreciate further features and advantages of the invention based on the above-described embodiments. Accordingly, the invention is not to be limited by what has been particularly shown and described, except as indicated by the appended claims. Further, although the constructs and methods provided for herein are generally directed to surgical techniques, at least some of the constructs and methods can be used in applications outside of the surgical field. All publications and references cited herein are expressly incorporated herein by reference in their entirety. 

What is claimed is:
 1. A suture construct formed from a suture filament, comprising: an enclosed loop formed by first and second limbs of the suture filament; a coaxial region formed by a first terminal end of the suture filament being disposed within a volume of an intermediate portion of the suture filament; and a second terminal end, wherein the loop is disposed proximal of a first end of the coaxial region and the second terminal end is disposed distal of the second, opposite end of the coaxial region.
 2. The construct of claim 1, wherein a length of the coaxial region is at least about 3 inches.
 3. The construct of claim 1, wherein a length of the coaxial region is in the range of about 3 inches to about 8 inches.
 4. The construct of claim 1, the enclosed loop further comprising a collapsible snare formed from at least one of the first and second limbs that form the enclosed loop.
 5. The construct of claim 4, wherein the collapsible snare includes a slidable knot such that a size of an opening defined by the snare is able to be decreased by moving the slidable knot away from the coaxial region and the size of the opening is able to be increased by moving the slidable knot towards the coaxial region.
 6. The construct of claim 5, wherein the slidable knot is one of a Buntline Hitch, a Tennessee Slider, a Duncan Loop, and a Hangman's Noose.
 7. The construct of claim 1, wherein the intermediate portion of the suture filament that is part of the coaxial region is cannulated.
 8. The construct of claim 1, wherein the intermediate portion of the suture filament in which the first terminal end of the suture filament is disposed to form the coaxial region has a core removed therefrom.
 9. The construct of claim 1, further comprising a junction at which the second limb engages the first limb is configured to be self-maintaining such that applying an axial force to the second terminal end away from the coaxial region along a longitudinal axis that extends through the coaxial region causes the intermediate portion to collapse around the first terminal end to maintain the first terminal end in the intermediate portion.
 10. The suture construct of claim 1, wherein the coaxial region is configured to be deconstructed after placement of the suture construct at a surgical location so the first and second limbs can be used to secure a location of the suture construct.
 11. The suture construct of claim 1, further comprising a suture anchor having a filament engagement feature, a portion of the construct being slidably disposed around a portion of the filament engagement feature.
 12. The suture construct of claim 11, wherein the coaxial region extends from one side of the anchor and a terminal end of the enclosed loop extends from another side of the anchor.
 13. The suture construct of claim 11, wherein a first portion of the enclosed loop extends from one side of the anchor and a second portion of the enclosed loop extends from another side of the anchor.
 14. The suture construct of claim 1, wherein the surgical filament comprises a braided suture. 